Selective article vending machine



K. E. HAMANN SELECTIVE ARTICLE VENDING MACHINE June 16, 1953 Filed Dec. 14, 1948 4 Sheets-Sheet 1 v INVEN TOR. Kum: E-HAMANN ATTORNEY.

' K. E. HAMANN SELECTIVE ARTICLE VENDING MACHINE June 16; 1953 4Sheets-Sheet 2 Filed- Dec. 14, .1948

IN V EN TOR. Ku/vu E. HAMANN June 16, 1953 K. E. HAMANN 3 9 SELECTIVE ARTICLE VENDING, MACHINE Filed Dec. 14, 1948 4-SheetS-Sheet 5 F .5; f 'Fg INVENTUR. Kum: EHAMFNN Patented June 16, 1953 r SELECTIVE ARTICLE VENDING MACHINE Kuno Edgar Hamann, Long Island City, N. Y., assignor to Joseph A. Lamprecht, Elizabeth,

Application December 14, 1948, Serial No. 65,179 4 Claims. (Cl. 194-54) to the vending position as its companion main column becomes exhausted of articles.

Another object of the invention is the provision, in a vending machine, of a novel lock-out chain comprised of one series of lock-out members or bars, and a second series of lock-out members or bars resting'upon and coextensive with the members or-bars of the first series and arranged so that wedge members, each mounted on and movable with the article ejector, may enter between abutting upper and lower lock-out members of the two series, and so that when the wedge member on one of the ejecto'r'members enters between said members at onepoint, none of the other ejector membersmay be actuated;

A further object of the invention is the provision of such a lock-out chain wherein the members of both series are of the same width with the exception that the members of one of said series are each narrowed in width at one end thereof, thereby making it impossible for a person, during-a vending operation wherein one ejector member is being manipulated, to pull on another ejector member to cause its wedge member to hold back the two lock-out chains so that others or the same ejector members may be operated without placing additional money in the machine. The wedge members can be held tensionally against the look-out members which werenot narrowed; "but thelock-out members of the other series which are narrowed'are not engaged by the wedge memberand they do return to their normal positions at the end of anoperation. This means that although one lock-out chain may be held against resetting, the other one cannot be prevented from resettin and therefore the. machine cannot be robbed.

Another object of the invention is the provision in avending machine, of a lock-outchain, the end member of which has movably mounted thereon, a locking bolt having a cam lug thereon'adapted to camagainst a coin of a predetermined value in a coin control in saidmachine and to be thereby chine can be operated.

Yet another object of the invention is the provision. in a vending machine, of a lock-out chain, the end member of which enters into and looks a shifted to an unlocked position, so that the macoin return mechanism in said machine against operation as soon as a'wedge member on one of the article ejector members enters between the abutting ends of any two lock-out members in said chain.

- Other objects and advantages of the invention will be apparent to-those skilled in the art, upon a study of this specification and the accompanying drawings.

Referring to the drawings, which are given by way of example to illustrate the invention:

Figure 1 is a perspective view of a vendin machine cabinet, housing mechanism embodying my improvements;

Figure 2 is a view of the machine as seen from above, having a portion cut away to show structural details;

v Figure 3 is a sectional elevation taken through one of the article columns of the machine, showing articles in the reserve column, and one article in the main column, and mechanism for shifting the bottom of the reserve column to the vending position as said one article is vended;

Figure 4 is a view similar to Figure 3, except that thelast'article is being delivered from the main column, and the reserve column has been shifted;

Figure 5 is a rear view of a portion of my vending machine, showing details of construction;

Figure 6 is an end elevation of the machine, showing the coin tester and scavenger, and the coin control and coin return mechanism;

Figure 7 is an elevation showing details of the coin control; I

Figure 8 is asectional elevation taken through the coin control and showing the path of coins therein;

Figure 9 is a sectional view taken with respect to Figure 8 and showing the path of accepted coins therethrough;

Figure 10 is a plan view of the right end of the lock-out chain, showing a wedge member on the end ejector member entered between the adjacent ends of the look-out members of the two lock-out chains and showing a pivoted locking'mem'ber .camming against a coin in the coin control to an unlocked position;

Figurell is similar to Figure 10, except that the ejector member has returned to its normal position and the locking member is in its locked position;

Figure 12 is an exploded'view showing the two series of lock-out elements forming the two lockout chains;

Figure 13 is a perspective view of the mechanism for shifting a reserve column to bring its lower end into vending position;

Figure 14 is a bottornview looking upwardly,

and showing the article ejector members, and their follow through pawls andratchets, and also showing the out of stock locks; Figure 15 is a sectionalv elevation taken along the lines 15- 4 5 of .Figllle'l and showing the out .of stock lock disabled by the presence of articles in thecolumn;

Figure 'l6is a view similar to Figure 15, except that the column has no merchandise therein, consequently, the out of stock lock prevents the article ejector from being operated; and

Fig. 17 is a fragmentary cross-section of a portion of the ejecting mechanism.

Referring to Figure 1, the cabinet 20 has a door 2!, hingedly mounted on the body 22 and secured in a closed position thereon by means of a lock 23. Mounted inthe door 2| is a coin slot 24, and below it is a coin return button 25. Formed in the lower portion of the door 2| is an article delivery port 25. Disposed in a row above the port 26 is a series of article delivery slides 28, 29, 3B and 3! which project from a support channel 21 which forms an integral part of the mechanism, and which projects through a rectangular opening 32 in the cabinet door 2|. Above the plate 2?, there is formed in the door an elongated display cavity which is covered by a curved transparent closure 33 through which articles of merchandise in the several columns may be seen.

Referring to Figures 2, 3 and 4, the mechanism has a frame including vertical end plates 34, 35 which have their rear edges'forming flanges 34a and 35a, respectively. Secured to the flanges, in any suitable manner, for example bymeans of screws 36, is a cross-member of Z cross-section 31; parallel to and spaced below the cross-member 31 is a cross-member 38 of substantially L cross-section, and this member is secured to the flanges 34a and 35a by means of screws 39. Spanning the space between the end plates 34 and 35 is a cross-member 40 having a horizontal portion 4!, a depending portion 42 integral therewith, and an upstanding portion 43 formed integral with the horizontal portion 4 I, which joins a horizontal portion 44, which has a trough 45 formed therein extending longitudinally thereof, said trough forming a guideway for the two lockout chains, which will presently be described.

Formed integral with the horizontal portion 44 is a depending portion 46. Secured to the portion 46 is a U-shaped channel 41 which has a downwardly extending flange 48, which is secured to the portion 45 by means of screws 49. The U-shaped channel has an upwardly extending flange 50, which forms a trim.

In Figures 3 and 4, the delivery slide 28 may be seen, and this consists of a flat rectangular plate 53 having a cylindrical grip i secured thereto by means of a screw 52. The inner end of the plate 53 is in the form of a downwardly directed curve 54.

Referring to Figure 14, the plate 53 has extending into it from one edge thereof, a spaced arcuate notch 55 and spaced apart therefrom is a second arcuate notch 56 and between these notches is formed a series of serrations 51. A

pawl 58 is pivotally carried on a stud 59 and a spring has one end secured to the pawl 58 and the other end secured to a second pawl 61 which is spaced apart therefrom and pivotally carried on a stud 62. The purpose of this pawl and the serrations 5! is as follows: When the article delivery slide is pulled outwardly to effect the delivery of an article, the pawl 58, which is normally positioned in the clearance notch 55, engages the serrations 5'! and is thereby partially rotated in a counter-clockwise direction. This makes it impossible to push the slide back in until it has completed its stroke. As the slide is pulled outwardly, the pawl 53 finally reaches the clearance notch 55 and is consequently freed from the serrations 51. Now, when the slide is camming surface 19.

returned to its normal position, the pawl is partially rotated in a clockwise direction, as it again engages the serrations 51, and the pawl is in engagement with the serrations 51 until it encounters the clearance notch 56, where it is released therefrom, and the slide remains in its normal position.

The slide 53 has an elongated slot 63 formed therein which communicates with a rectangular opening 64. Parallel to one end of the rectangular opening 64 is a depending lug or boss 65 which is tipped to accommodate a shouldered screw 66; Journaled on the shouldered screw 66 is a lever 61 which may best be seen in Figures .15 and 16.

The lever 61 has a horizontal portion 68 which has a notch 69 formed in the end thereof. The lever also has a short vertical portion 10 from which a horizontal arm H projects. The horizontal arm 1! works into and out of the slot 63. The extreme left end of the arm H, as seen in Figure 16, has a downwardly extending portion 12 and this terminates in a horizontal portion 13 which is. somewhat parallel to and spaced downwardly from the arm 'H. A bracket 14 is secured to the lower surface of the horizontal portion 44 and this bracket has a horizontal portion 15 which is engaged by the notch 69 in the arm 38 when there is-no merchandise in the column associated with the slide 53. When there is merchandise in thecolumn associated with the slide 53, the arm H of the lever 6'! is depressed, thereby causing the end carrying the notch 69 to rise so that the notch moves in a path above the horizontal portion 'l5 and thereby the slide is free to move (insofar as the lever 61 is concerned), when merchandise is in position in the column with which the slide is associated.

A stud 16 has a shank 1! of reduced diameter which extends through a hole formed in the slide 53 so that the body part 16 extends downwardly. Positioned on the shank portion 11 and bearing against the upper surface of the slide 53 is an interposer member '18 which has an angular The interposer is secured on the slide 53 by means of a nut threadedly engaging the shank TI. The interposer has an upturned tail 8|, the function of which will be presently described. This interposer may be clearly seen in the plan views (Figs. 10 and 11).

It will be noted in Figures 15 and 16 that the interposer '18 is comprised of two separate pieces, one on top of the other. The function of the interposers is for them to cam themselves in between abutting elements of a lock-out chain. In the embodiment shown in the drawings,-I employ two lock-out chains, one superimposed on the other, and I would like to point out that although the shapes of the two pieces comprising each interposer are identical, they may be made in other shapes not identical with each other, in which instance the shapes of the camming surfaces of the elements of the lock-out chain would be suitably shaped to cooperate with them.

Since all of the article ejector slides are substantially identical, it is believed that the description of the slide 53 will sufiice for all of them, making it unnecessary to repeat this description three additional times to cover the four article delivery slides 23, 25, 30 and 3|.

Extending across the machine beneath all the article delivery slides 28, 2S, 3!! and 3!. is a bar 32 which has downward extensions 83 and 84 which are pivotally connected to the end plates 34 and 35, respectively, one such connection bein accents shown at :85, Figure :4. In each end "plate iadj a- '86. Spaced apartfrom and at a higher level in said end plates are formed elongated hole's,.such

as the hole'tl.

Extending across the machine and extending through the hole :81 in each end plate is farold 1 88, one end of which has a connecting trod 89 .pivotally connected thereto at 98, Figure 114. The :other end of this vconnec'tingrod has a screw 9| extending 'therethrough and engaging the end I 8! of the bar 82 via the hole 88. A spring 92 :is secured to the screw *9! and to the depending portion 42 of the frame :member 40, and urges both the bar v82 and the rod rearwardly in :the

machine. The other end of the 10'121188 has-a connecting rod 93 connected thereto at 94, and this connecting rod 'is'connected .to the other end 83 of the bar82'via the hole "86 with a screw 95 and a spring .95 has one end'connected to the screw 195 and to the frame member 4| so that this :spring also urges the bar and the rod're arwardly. T

In Figures 3, 4, '14, '15 and 16, it will be'noted that when any one offthe article ejeotors 28 to 3! ispulled out, the depending stud, such as the stud l6,engages the bar 82 and moves it forward as the ejector slide moves forward. This causes the bar88 to' move forward also with the following result: I

Referring to Eigure'3, as 'the'ejector slide 2'8 ;is :pulledtothe'left, it'is moved from under the lowest .article 191, allowing said article to move down and come toireston the web 5| of'the cross member 40. By this time the 'rod '88, due to its interconnection with the bar 82, is positioned at the left endspf the aligned slots 3'5, so the article 91 is between the right end of the ejector 28 and therodiiii. Now, as soon as the ejector "starts to return to its normal position (to the right) the article and 'the'rod 88 move therewith until a point is reached where the article passes beyond the right edge of the support '4! and passes via the passage 'Ill'il, formed between the curved wall 98 and'the bafiie E9, to the delivery opening'ZG (Figure l). Asthe article'dl is being moved tothe right as described, and passes out from under the next succeeding-article, the latter moves down and rests upon theupper surface of the article delivery slide =28.

In connection with Figure 3, "it will benoted. "that the articles are carried in a column I02 having two article'p-assages HH and 103 therein.

The article 9? is, the last one in thepassage I01. Now since a spring we urges the bottom of'the column-outwardly, the column being pivoted on the framearms, an arm l0! of a bell crank 108, forming partbof mechanism which has "the column locked in the position shown in Figure 3, is uncovered so that the bell crank "is 'free to swing up to the position shown in Figure 3.

This allows the trip mechanism to trip onthe arrive on the upper surface "of theejector plate .28. A description of the trip mechanism will he hereinafter made in connection with Figures 2 and 13.

i6 rgltu'dinal "troughway '45 and includes free s'lidable elements H0, .Ill, H2, H3 and H4which abut each'other endwise. Theseelements arefall identical except the element H4. 'Each has its rear edge notched out from theright end as seen in Figure 12 and each notch is designated by the numeral 1 I5, and each, with the exception of element .I I0, has a beveled end H 6 .formed thereon. The element H4 has a threaded hole I i1 formed therein.

Beneath these lockout elements are a second series :of lockout elements H8, H9, I20, I2! and I22, the lengths which are identical with the elements of the'first series, except that the element 922 is longer than the element H4. x-Each upper element .:is positioned on a lower element and the abutting ends of all of them are coincident so that when an article ejector slide is pulled, the interposer 18 thereon enters between both the abutting ends of two lower elements and the abutting ends of two upper elements.

The left ends of all of the lower elements ex- .cept the end element H8 have bevels I23"formed thereon which coincide with the bevels N6 -'of the upper elements. I

a The element 122 has a stop pin l2 l extending downwardly therefrom. A barrier I at the left-end of the chain consists of a horizontal body I26 having a hole I21 thereinand has an upturned end I23 against which the leftends of the elements H0 and H3 abut. The element i25' is secured in the troughway by means of a screwpassing through the hole I21. The purpose of .the notches H5Iis to'prevent a dishonest person from cheating by pulling a second ejector slide to force, the interposer thereonagainst any 'Of said elements, while another ejector slide is in an outward position, and preventing them from returnmg to their normal positions when said first ejector slide is returned to its normal :ment.

Figure *6, is acoin control I36, and mounted above it and communicating therewith is a scavenger and coin tester 129, which is a purchased device. Secured on the end plate is a block i 3 having a lug lezthereon engaged by a shouldered screw I33, Figure 6.- Journaled on this screw is-a bell crank ltd, one arm er which is --pivotally-connected to a rod extending down from the scavenger. The otherarm'has an elon- "gated slot I35 therein which engages a stud I31 carried by a coin return bar I38. A pin I39 in this bar limits its forward movement, and the -bards urged Iorwerdlybya spring lei) engaging an ear ween the bar and a post it on the contrc'l. The bar 438 has a rectangular slot Hi3 formed therein. which is normally in alignment with the end of the lower lockout chain element Referring now to' Figures 2 and 10 to 13 'inelusive, the lockout chain is disposed'in a lon' so that as a purchaser pulls an ejector slide rerward, the interposer lStherec'n enters thelock out chain and the end elements M and i2! of th respective series of lock out elements are 'movedendwise- What happens when I M is moved will be presently described. However, the end of the element I22 enters the slot 143 formed in the coin return bar I38 and prevents the purchaser from operating the coin return bar.

If the purchaser wants his money back before a delivery cycle of the machine is started, he may press the coin return button 25, thereby moving the bar I98 rearwardly against the urge of the spring I40. This opens the scavenger, and at the same time a lug I44 on the bar I38 acts against a lug I45 on a gate member I46, thereby releasing the coin I41 and allowing it to roll down the incline I49, like MM, and into the coin return chute I48. The gate member is hinged at I50 and is urged to its normal position by spring means within its hinge joints, Figs. -6 and '7.

Coins enter the control via a passage II, Figure 8, between plates I52 and I53, and the first coin comes to rest on a tab I54 formed on a lever I55 which is hinged at I55 and urged to its normal position by a spring I51.

A lever I58, hinged at I59 on the plate I52, has a tab It! on its lower end which may extend through a hole I50 in the plate I52 and contacts the plate I53, thereby preventing other coins (where several are inserted) from passing into the accepted coin receptacle. This lever is urged inwardly by a spring I52, Figure 9, and movesin unison with the lever I55 due to the fact that the tab I55a extending between them is always in contact with the lever I55.

Referring to Figures and 11, the lockout element [I4 has a shouldered screw I63 engaging the threaded hole II1 (Figure 12) and journaled a 53 by means of a screw I68 sothat the spring.

urges the lever in a counter-clockwise direction, as seen in Figures 10 and 11. The lever I04 has a lateral extension I69 thereon having an angular cam surface I10 formed thereon. The end I'I'I has a notch I12 formed thereon. This end extends through a rectangular hole I13 in a fixed frame member I14, and the notch I 12 engages the solid portion Ila of the frame member adjacent to one end of the rectangular hole I13, and thus the machine is locked up so that no interposer can enter the lockout chain.

Figure 10 shows the relative position of a coin I41 in a position to unlock the machine. This is the position shown in Figure 7 suitably supported by elements described in connection with Figures 6, 7, 8 and 9. The interposer has started to enter the lookout chain and the cam surface I10 on the lever has cammed against the edge of the coin I51 and has caused the lever I64 to move in a clockwise direction as seen in Figure 10, thereby disengaging notch I12 from the solid portion I 14a at the end of the hole I13 and allowing the end I1 I, I12 of the lever to pass through the hole I13. A pin I15 on the lever I64 engages the lever I55, when it has moved sufficiently to contact lever I55, displacing the same and allowing the coin to pass into an accepted receptacle. At the same time the interposer 18 may freely enter the lockout chain as the slide ejector is manipulated to eifect the delivery of a desired article.

The bell crank I08'(Figures 2, 3, 4 and 13) has in addition to the arm I01, an arm I16 which has a cross extension I11 on its outer end. This bell crank is journaled on a stud shaft I18 carried in a bracket I19 on the column I02. An angle member I80, Figure 13, of which the bracket is an integral part, is secured on the article column with its edge I8I flush with the lower end of the column.

A U shaped channel I82 having legs I83 and 8 I84 has hooks I85 and I86 formed on the ends thereof. This channel is journaled on a shaft I31 and is urged upwardly by a spring I89, and

7 its upward limit of movement is defined by fixed lugs I89 and I90. The legs I83 and I84 have concave curved upper surfaces I9! and I92. Fixed triangular members have edges I93 and I94 forming stops to be engaged by the edge I8I on the article column I02 when it is released.

In Figure 3, the column I82 is shown with its angle edge I8I engaged by the hooks on the ends of the U shaped member and retained in a vertical position. When the front section IIII of the column has more than one article in it, the arm I 01 of the bell crank is held in a vertically downward position by the articles, and when this is the case, the cross member I11 is held up above the path traversed by the tail 8| on the interposer. However, when only one article is left in the section IOI, the arm I01 is free to swing upwardly and the cross end I11 moves downwardly until it contacts the concave surfaces I9! and I92. After this occurs, the next time the article ejector is pulled outwardly, the cross member I11 ratchets over the tail BI on the interposer so that when the ejector moves inwardly again, the tail 8I engages the cross-member I11, causing it to move downwardly and along the concave surfaces. This forces the legs I 83 and I84 downwardly, releasing the edge IBI of the angle member and allowing the bottom of the column I02 to swing outwardly under the urge of spring I05 until arrested by the engagement of the edge I8I with the stop I edges I 93 and I94, thereby positioning the section I03 for delivering articles therefrom. This position is shown in Figure 4.

For vending articles'which are cylindrical in form, reference is made to the modification in Figure 17, wherein a shaft I96 is journaled in both the end plates 34 and 35 and is spring loaded so that it is urged in a counter-clockwise direction. Secured in the shaft I98 is a metallic strip I91, the end I 98 of which is curved and is adapted to partially embrace the rod 88 when it is in its extreme position to the left end of the slot 81, as seen in Figure 17. This strip cams against the rod 88 as it is moved back and forth in the slot 81 and only in the extreme left posit1on of the rod 88 does the portion I98 partially embrace the rod.

In Figure 17, the article ejector slide is not shown withdrawn. However, when the rod 89 is in the position shown in solid lines, the article ejector slide 25 is withdrawn so that the article I99 may drop down on the ledge 4| between the bar 88 and the end 54 of the article ejector 28. Now, when the article ejector is again moved inwardly, the article I99, between the end 54 and the plate member I91, rolls along the surface of the ledge II to the right, and while this is occurring, the plate member is traversing an are indicated by dotted lines, so that as soon as the curved end I98 of the plate member is far enough from the right edge of the ledge 4! for the article to pass therebetween, it rolls out and downwardly into the article delivery opening 28.

It is understood that the above detailed description of the present invention is intended to disclose an embodiment thereof to those skilled in the art, but that the invention is not to be construed as limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of being practiced and carried out in various ways without departing 9 from the spirit of the invention. The language used in the specification relating to the operation and function of the elements of the invention, is employed for purposes of description and not a lock out chain comprised of two series Of' aligned elongated elements of rectangular crosssection supported on a common plane, the elements of each series having abutting ends in alignment with a different one of said interposers, said entering wedge portion being adapted to enter between the abutting ends in alignment therewith, said chain having a fixed barrier at one end thereof contacted by the first end elements in-each series, the elements in bothsaid nearest to the entering wedge portion of a cooperating interposer, notched so that they cannot be held against movement and thereby cheat the machine, a coin mechanism, a coin return mechanism having a. movable member, a lever pivotally mounted on the second 'end element of said last mentioned series and comprising a lock normally locking said lock out chain, cam

means on said lever extending into said co mechanism and adapted to cam against a coin' positioned therein and thereby to unlock said chain, and means carried by the second end elementin the other of said series adapted to cooperate with and lock said movable member of the coin return as long as said upper series is unlocked by the presence of a coin in said coin control. I i

2. In a vending machine having a plurality v of article columns, a series of article ejectors for ejecting articles therefrom, each of said ejectors carrying an interposer, a lock out chain disposed across the paths of said' interposers,

' said lock out chain being comprised of two series of movable elements of rectangular cross section,

one resting on top of the other and both dis-V posed in a longitudinal guideway and having abutting ends in alignment with said interposers, a fixed barrier at one end of said lock out chain so that the increase in length of the chain due to the entering of any interposer is in a direction out chain and so positioned relative to said last element that the latter enters said opening and remains in it during a vending operation, and non-wedging means formed. in the elements of the series which is normally lockedfor preventli) ing the holding of that series against resetting by a vendee.

3. In a vending machine having article c01- umns, article ejectors cooperating therewith and an interposer moved by each injector, a lock out chain comprised of two series of superimposed elongated movable elements of rectangular crosssection disposed in a longitudinal guideway, each element of the upper series being positioned atop its corresponding element in the lower series, the elements at one end of said chain abutting a fixed barrier and the elements at the other end of said chain being movable by any interposer entering said chain, one of said last mentioned elements in the lower series carrying means to lock the coin return bar of a coin control carried in said machine and the other of said elements in the upper'series carrying lever means adapted to cam against a coin positioned in said coin control'for unlocking the machine and initiating a vendingoperation, each of the elements in the upper of said series having its edge, adjacent to the corner facing away from said fixed barrier and nearest to a cooperating interposer, notched so that an operator cannot prevent the lock out chains from resetting and thereby defraud the machine.

4. In a vending machine, a lock out chain comprised of a first series of rectangular movable elements disposed in a trough like depression in said machine and having abutting ends in alignment with interposers, each of which is carried on a different one of the article ejectors of a series of article ejectors in said machine, a fixed barrier at one end of said series, a second series of rectangular movable elements disposed upon said first series and cooperating with said barrier, the elements in said second series being like in length to those in said first series with the exception of the free end elements in each series, each interposer having an entering wedge portion in alignment with the abutting ends of the adjacent elements so that it may enter between-the abutting ends. of two adjacent elements in each series conjointly, a coin return fmechanism, a coin control mechanism, means cooperating with the free end element in said first series for locking said coin return mechanism against operation when said entering wedge portion had conjointly entered inbetween the adjacent elements of both series, and means on the free end'element of the second series normally locked but adapted to cooperate with a coin in said coin control mechanism to release itself and permit said conjoint action, each of the elements in said second series with the exception of the free end element having its edge, adjacent to the corner facing away from said barrier and nearest to the entering wedge portion of a cooperating interposer, notched to prevent a person from defrauding the machine, the free end. element of said second series which is normally,

locked being of the same series in which the other elements are notched as aforesaid.

KUNO EDGAR HAMANN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,948,650 Du Grenier Feb. 2'7, 1934 2,156,531 Geer May 2, 1939 2,159,603 Rowe et a1. May 23, 1939 2,197,633 Du Grenier Apr. 16, 1940 2,379,501 Steiner et a1 July 3, 1945 

